The best thing for you do to in order to figure out a data rate for a video format would be to use something like the AJA Data Calculator. You can find it over on AJA's website under downloads.

Another thing to do is start your streaming, and open the network monitor under your Applications > Utilities folder, and look at what the network is doing while streaming.

Of course these are super simple methods of figuring out "bandwidth" for the video......

I would encourage you to look at other responses here on the forums.
Having that many workstations streaming uncompressed video is going to be a hefty load on the network and on the storage. So make sure you're looking at real time solutions, and not just "pure bandwidth" solutions. ---- Real time is the key....Bandwidth just means you have the means to pass the data size required......not the means to "sustain" it in real time......especially with 10 clients doing it at once.